Adding password to GRUB bootloader?

I have fedora core 1 running 3 kernels 2.4.22-18 , 2.6.0, 2.6.3. I have installed it on a ext3 filesystem. Everything was going well untill I discovered that my brother was using linux 1 command and breaking my root password every day. So I decided that to have a GRUB password. So what I want is to enable the GRUB password without reinstalling my system. But I didn't find a way to do this. Please help me...

Sunny, it doesn't works. It gives me "Must be authenticated" when i am logging in as root. I thought of the idea that is presented by sam but I thought it was too risky to play around with the system files.
Can u tell me how can I decrypt this hashes from md5crypt command if accidently i just forgot the password.
Thanks for ur comments.

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